S-92210A551 1/4"-20 x 2 1/4" ASME B18.3 Stainless Steel Hex Drive Flat Head Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 stainless steel construction and passivated finish for extended service life in harsh environments
• Precise thread engagement with Class 3A thread fit ensuring reliable, vibration-resistant connections in critical applications
• High tensile strength rated at 70,000 psi for dependable performance under substantial mechanical stress
• Optimal flush mounting with standard 82° countersink angle and flat head design for smooth surface finishes
• Enhanced torque transmission through hex drive design (5/32") preventing cam-out during installation
• Full threading coverage along the 2-1/4" length providing maximum grip strength and load distribution
• Industry compliance assurance meeting ASME B18.3 specifications and environmental regulations (RoHS 3, REACH)

Professional Applications & Engineering Value

These 1/4"-20 UNC flat head screws deliver exceptional engineering value in demanding industrial applications where corrosion resistance and structural integrity are paramount. The combination of 18-8 stainless steel material and passivated finish creates a robust barrier against chemical exposure and atmospheric corrosion, making them ideal for marine equipment, food processing machinery, and outdoor structural assemblies. The Class 3A thread fit with coarse thread spacing ensures rapid installation while maintaining vibration resistance in high-stress environments. The hex drive system provides superior torque transmission compared to slotted alternatives, reducing installation time and preventing fastener damage. The fully threaded design maximizes engagement depth, distributing mechanical loads evenly across the entire fastener length for enhanced joint reliability in critical connections.

Specification Summary & Compliance

Manufactured to precise dimensional standards with Class 3A thread fit tolerance and UNC thread form (1/4"-20) in the inch measurement system. These flat head screws feature a standard profile with 82° countersink angle and are fully threaded along the 2-1/4" length. The fasteners conform to ASME B18.3 manufacturing specifications and demonstrate compliance with environmental regulations including RoHS 3 (2015/863/EU) and REACH (EC 1907/2006). Mechanical properties include Rockwell B55 hardness and 70,000 psi tensile strength, ensuring consistent performance across industrial applications.